Bip39 cryptotag http://www.mediafire.com/file/uilrjfajg2ami24/pdf-14673-57158.pdf It is very important that the mnemonic sentences are generated from randomly selected numbers! These numbers may be generated in a variety of other ways, which are described in other articles here, like "What's an RNG" and Seed Phrase Technology. BIP39 is like a chance to “browse” https://bookmarklinx.com/story20144811/bip39-checksum-word-a-simple-key-for-bip39-github-unveiled-https-linktr-ee-bip39